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737.5 MW Batteries (25 MW) + Natural Gas Fired Combustion Turbine (322 MW) + Natural Gas Steam Turbine (390 MW) + Solar Photovoltaic (0 MW) operating in Maricopa, AZ — Salt River Project
737.5 MW
Nameplate Capacity
10
Generators
units
Hybrid (4)
Technology
Batteries + Natural Gas Fired Combustion Turbine + Natural Gas Steam Turbine + Solar Photovoltaic
1957
Operating Since
Coordinates
33.5561, -112.2153
County
Maricopa, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Salt River Project | Salt River Project | — |
| Owner(s) | Salt River Project | Salt River Project | — |
| Status | Operating | retired | — |
The Agua Fria power plant is located in Maricopa County, Arizona. It is owned and operated by Salt River Project. The plant has a total capacity of 737.5 MW and is considered a hybrid facility, utilizing multiple generation technologies including natural gas-fired combustion turbines, natural gas steam turbines, solar photovoltaic, and battery energy storage. Agua Fria consists of 10 generators and first began operating in 1957. The battery energy storage system (BESS) has a capacity of 100 MWh and a duration of 4 hours, utilizing lithium-ion battery chemistry (LIB). The solar photovoltaic array uses single-axis tracking.
Agua Fria operates within the Salt River Project balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. In the most recent year of available data, the plant generated 244,296 MWh, resulting in a capacity factor of 3.7%. Agua Fria is ranked as the 8th largest power plant out of 26 in Arizona, and 282nd out of 945 nationally.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Salt River Project (SRP)
Grid Voltage
230.0 kV
Regulatory Status
RE — Regulated
Entity Type
Political Subdivision
Sector
Electric Utility
1.5K MWh
Latest Month
244.3K MWh
Annual Generation
3.7%
Capacity Factor
CO₂ Intensity
1351 lb/MWh
NOx
3 lb/MWh
SO₂
0.007 lb/MWh
CH₄
0.026 lb/MWh
N₂O
0.003 lb/MWh
Capacity Factor
2.4%
Annual Net Gen
152 GWh
CO₂eq
1353 lb/MWh
Subregion
WECC Southwest
2013
$965/kW
Est. Construction Cost
Total estimated cost: $711.8M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-14
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